What is the combined amp-hour capacity of the APU Battery and Main Battery?

• A. 60
• B. 43
• C. 17
• D. 0

Answer: (A)

Amp-hour capacity tells you how much charge you have to draw over time. When two batteries with the same voltage are connected to the same load, their amp-hours add together, so you effectively have a bigger store of energy. This is the idea behind combining the APU battery and the main battery: they share the same electrical system, so their capacities sum to give the total available energy. It’s important to note that this additive effect happens when they’re effectively in parallel or supplying the same circuit at the same voltage; if they were in series, you’d get more voltage but not more amp-hours. So the correct choice is the one that reflects that total sum of the two batteries’ capacities. The other options correspond to using only one battery, a smaller total, or no energy at all, none of which describe the combined energy correctly.